<?php // $Id: view.php,v 1.95.2.9 2008/12/31 15:51:28 skodak Exp $

/////////////////////////////////////////////////////////////////////////////
//																		 //
// NOTICE OF COPYRIGHT													 //
//																		 //
// Moodle - Calendar extension											 //
//																		 //
// Copyright (C) 2003-2004  Greek School Network			www.sch.gr	 //
//																		 //
// Designed by:															//
//	 Avgoustos Tsinakos (tsinakos@teikav.edu.gr)						 //
//	 Jon Papaioannou (pj@moodle.org)									 //
//																		 //
// Programming and development:											//
//	 Jon Papaioannou (pj@moodle.org)									 //
//																		 //
// For bugs, suggestions, etc contact:									 //
//	 Jon Papaioannou (pj@moodle.org)									 //
//																		 //
// The current module was developed at the University of Macedonia		 //
// (www.uom.gr) under the funding of the Greek School Network (www.sch.gr) //
// The aim of this project is to provide additional and improved		   //
// functionality to the Asynchronous Distance Education service that the   //
// Greek School Network deploys.										   //
//																		 //
// This program is free software; you can redistribute it and/or modify	//
// it under the terms of the GNU General Public License as published by	//
// the Free Software Foundation; either version 2 of the License, or	   //
// (at your option) any later version.									 //
//																		 //
// This program is distributed in the hope that it will be useful,		 //
// but WITHOUT ANY WARRANTY; without even the implied warranty of		  //
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the		   //
// GNU General Public License for more details:							//
//																		 //
//		  http://www.gnu.org/copyleft/gpl.html						   //
//																		 //
/////////////////////////////////////////////////////////////////////////////

//  Display the calendar page.

	require_once('../config.php');
	require_once($CFG->dirroot.'/course/lib.php');
	require_once($CFG->dirroot.'/calendar/lib.php');

	$courseid = optional_param('course', 0, PARAM_INT);
	$view = optional_param('view', 'upcoming', PARAM_ALPHA);
	$day  = optional_param('cal_d', 0, PARAM_INT);
	$mon  = optional_param('cal_m', 0, PARAM_INT);
	$yr   = optional_param('cal_y', 0, PARAM_INT);

	if(!$site = get_site()) {
		redirect($CFG->wwwroot.'/'.$CFG->admin.'/index.php');
	}

	if ($courseid) {
		require_login($courseid);
	} else if ($CFG->forcelogin) {
		require_login();
	}

	// Initialize the session variables
	calendar_session_vars();

	//add_to_log($course->id, "course", "view", "view.php?id=$course->id", "$course->id");
	$now = usergetdate(time());
	$pagetitle = '';

	$strcalendar = get_string('calendar', 'calendar');
	$navlinks = array();
	$navlinks[] = array('name' => $strcalendar,
						'link' =>calendar_get_link_href(CALENDAR_URL.'view.php?view=upcoming&amp;course='.$courseid.'&amp;',
														$now['mday'], $now['mon'], $now['year']),
						'type' => 'misc');


	if(!checkdate($mon, $day, $yr)) {
		$day = intval($now['mday']);
		$mon = intval($now['mon']);
		$yr = intval($now['year']);
	}
	$time = make_timestamp($yr, $mon, $day);

	switch($view) {
		case 'day':
			$navlinks[] = array('name' => userdate($time, get_string('strftimedate')), 'link' => null, 'type' => 'misc');
			$pagetitle = get_string('dayview', 'calendar');
		break;
		case 'month':
			$navlinks[] = array('name' => userdate($time, get_string('strftimemonthyear')), 'link' => null, 'type' => 'misc');
			$pagetitle = get_string('detailedmonthview', 'calendar');
		break;
		case 'upcoming':
			$pagetitle = get_string('upcomingevents', 'calendar');
		break;
	}

	// If a course has been supplied in the URL, change the filters to show that one
	if (!empty($courseid)) {
		if ($course = get_record('course', 'id', $courseid)) {
			if ($course->id == SITEID) {
				// If coming from the home page, show all courses
				$SESSION->cal_courses_shown = calendar_get_default_courses(true);
				calendar_set_referring_course(0);

			} else {
				// Otherwise show just this one
				$SESSION->cal_courses_shown = $course->id;
				calendar_set_referring_course($SESSION->cal_courses_shown);
			}
		}
	} else {
		$course = null;
	}

	if (empty($USER->id) or isguest()) {
		$defaultcourses = calendar_get_default_courses();
		calendar_set_filters($courses, $groups, $users, $defaultcourses, $defaultcourses);

	} else {
		calendar_set_filters($courses, $groups, $users);
	}

	// Let's see if we are supposed to provide a referring course link
	// but NOT for the "main page" course
	if ($SESSION->cal_course_referer != SITEID &&
	   ($shortname = get_field('course', 'shortname', 'id', $SESSION->cal_course_referer)) !== false) {
		require_login();
		if (empty($course)) {
			$course = get_record('course', 'id', $SESSION->cal_course_referer); // Useful to have around
		}
	}

	$strcalendar = get_string('calendar', 'calendar');
	$prefsbutton = calendar_preferences_button();

	// Print title and header
	$navigation = build_navigation($navlinks);
	print_header("$site->shortname: $strcalendar: $pagetitle", $strcalendar, $navigation,
				 '', '', true, $prefsbutton, user_login_string($site));

	echo calendar_overlib_html();

	// Layout the whole page as three big columns.
	echo '<table id="calendar" style="height:100%;">';
	echo '<tr>';

	// START: Main column

	echo '<td class="maincalendar">';
	echo '<div class="heightcontainer">';

	switch($view) {
		case 'day':
			calendar_show_day($day, $mon, $yr, $courses, $groups, $users, $courseid);
		break;
		case 'month':
			calendar_show_month_detailed($mon, $yr, $courses, $groups, $users, $courseid);
		break;
		case 'upcoming':
			calendar_show_upcoming_events($courses, $groups, $users, get_user_preferences('calendar_lookahead', CALENDAR_UPCOMING_DAYS), get_user_preferences('calendar_maxevents', CALENDAR_UPCOMING_MAXEVENTS), $courseid);
		break;
	}

	//Link to calendar export page
	echo '<div class="bottom">';
	if (!empty($CFG->enablecalendarexport)) {
		print_single_button('export.php', array('course'=>$courseid), get_string('exportcalendar', 'calendar'));

		if (!empty($USER->id)) {
			$authtoken = sha1($USER->username . $USER->password . $CFG->calendar_exportsalt);
			$usernameencoded = urlencode($USER->username);

			echo "<a href=\"export_execute.php?preset_what=all&amp;preset_time=recentupcoming&amp;username=$usernameencoded&amp;authtoken=$authtoken\">"
				 .'<img src="'.$CFG->pixpath.'/i/ical.gif" height="14" width="36" '
				 .'alt="'.get_string('ical', 'calendar').'" '
				 .'title="'.get_string('quickdownloadcalendar', 'calendar').'" />'
				 .'</a>';
		}
	}

	echo '</div>';
	echo '</div>';
	echo '</td>';

	// END: Main column

	// START: Last column (3-month display)
	echo '<td class="sidecalendar">';
	list($prevmon, $prevyr) = calendar_sub_month($mon, $yr);
	list($nextmon, $nextyr) = calendar_add_month($mon, $yr);
	$getvars = 'id='.$courseid.'&amp;cal_d='.$day.'&amp;cal_m='.$mon.'&amp;cal_y='.$yr; // For filtering

	echo '<div class="sideblock">';
	echo '<div class="header"><h2>'.get_string('eventskey', 'calendar').'</h2></div>';
	echo '<div class="filters">';
	echo calendar_filter_controls($view, $getvars, NULL, $courses);
	echo '</div>';
	echo '</div>';

	echo '<div class="sideblock">';
	echo '<div class="header"><h2>'.get_string('monthlyview', 'calendar').'</h2></div>';

	echo '<div class="minicalendarblock minicalendartop">';
	echo calendar_top_controls('display', array('id' => $courseid, 'm' => $prevmon, 'y' => $prevyr));
	echo calendar_get_mini($courses, $groups, $users, $prevmon, $prevyr);
	echo '</div><div class="minicalendarblock">';
	echo calendar_top_controls('display', array('id' => $courseid, 'm' => $mon, 'y' => $yr));
	echo calendar_get_mini($courses, $groups, $users, $mon, $yr);
	echo '</div><div class="minicalendarblock">';
	echo calendar_top_controls('display', array('id' => $courseid, 'm' => $nextmon, 'y' => $nextyr));
	echo calendar_get_mini($courses, $groups, $users, $nextmon, $nextyr);
	echo '</div>';
	echo '</div>';

	echo '</td>';

	echo '</tr></table>';

	print_footer();



function calendar_show_day($d, $m, $y, $courses, $groups, $users, $courseid) {
	global $CFG, $USER;

	if (!checkdate($m, $d, $y)) {
		$now = usergetdate(time());
		list($d, $m, $y) = array(intval($now['mday']), intval($now['mon']), intval($now['year']));
	}

	$getvars = 'from=day&amp;cal_d='.$d.'&amp;cal_m='.$m.'&amp;cal_y='.$y; // For filtering

	$starttime = make_timestamp($y, $m, $d);
	$endtime   = make_timestamp($y, $m, $d + 1) - 1;

	$events = calendar_get_upcoming($courses, $groups, $users, 1, 100, $starttime);

	$text = '';
	if (!isguest() && !empty($USER->id) && calendar_user_can_add_event()) {
		$text.= '<div class="buttons">';
		$text.= '<form action="'.CALENDAR_URL.'event.php" method="get">';
		$text.= '<div>';
		$text.= '<input type="hidden" name="action" value="new" />';
		$text.= '<input type="hidden" name="course" value="'.$courseid.'" />';
		$text.= '<input type="hidden" name="cal_d" value="'.$d.'" />';
		$text.= '<input type="hidden" name="cal_m" value="'.$m.'" />';
		$text.= '<input type="hidden" name="cal_y" value="'.$y.'" />';
		$text.= '<input type="submit" value="'.get_string('newevent', 'calendar').'" />';
		$text.= '</div></form></div>';
	}

	$text .= get_string('dayview', 'calendar').': '.calendar_course_filter_selector($getvars);

	echo '<div class="header">'.$text.'</div>';

	echo '<div class="controls">'.calendar_top_controls('day', array('id' => $courseid, 'd' => $d, 'm' => $m, 'y' => $y)).'</div>';

	if (empty($events)) {
		// There is nothing to display today.
		echo '<h3>'.get_string('daywithnoevents', 'calendar').'</h3>';

	} else {

		echo '<div class="eventlist">';

		$underway = array();

		// First, print details about events that start today
		foreach ($events as $event) {

			$event->calendarcourseid = $courseid;

			if ($event->timestart >= $starttime && $event->timestart <= $endtime) {  // Print it now


/*
				$dayend = calendar_day_representation($event->timestart + $event->timeduration);
				$timeend = calendar_time_representation($event->timestart + $event->timeduration);
				$enddate = usergetdate($event->timestart + $event->timeduration);
				// Set printable representation
				echo calendar_get_link_tag($dayend, CALENDAR_URL.'view.php?view=day'.$morehref.'&amp;', $enddate['mday'], $enddate['mon'], $enddate['year']).' ('.$timeend.')';
*/
				//unset($event->time);

				$event->time = calendar_format_event_time($event, time(), '', false, $starttime);
				calendar_print_event($event);

			} else {																 // Save this for later
				$underway[] = $event;
			}
		}

		// Then, show a list of all events that just span this day
		if (!empty($underway)) {
			echo '<h3>'.get_string('spanningevents', 'calendar').':</h3>';
			foreach ($underway as $event) {
				$event->time = calendar_format_event_time($event, time(), '', false, $starttime);
				calendar_print_event($event);
			}
		}

		echo '</div>';

	}
}

function calendar_show_month_detailed($m, $y, $courses, $groups, $users, $courseid) {
	global $CFG, $SESSION, $USER, $CALENDARDAYS;
	global $day, $mon, $yr;

	$getvars = 'from=month&amp;cal_d='.$day.'&amp;cal_m='.$mon.'&amp;cal_y='.$yr; // For filtering

	$display = &New stdClass;
	$display->minwday = get_user_preferences('calendar_startwday', CALENDAR_STARTING_WEEKDAY);
	$display->maxwday = $display->minwday + 6;

	if(!empty($m) && !empty($y)) {
		$thisdate = usergetdate(time()); // Time and day at the user's location
		if($m == $thisdate['mon'] && $y == $thisdate['year']) {
			// Navigated to this month
			$date = $thisdate;
			$display->thismonth = true;
		}
		else {
			// Navigated to other month, let's do a nice trick and save us a lot of work...
			if(!checkdate($m, 1, $y)) {
				$date = array('mday' => 1, 'mon' => $thisdate['mon'], 'year' => $thisdate['year']);
				$display->thismonth = true;
			}
			else {
				$date = array('mday' => 1, 'mon' => $m, 'year' => $y);
				$display->thismonth = false;
			}
		}
	}
	else {
		$date = usergetdate(time());
		$display->thismonth = true;
	}

	// Fill in the variables we 're going to use, nice and tidy
	list($d, $m, $y) = array($date['mday'], $date['mon'], $date['year']); // This is what we want to display
	$display->maxdays = calendar_days_in_month($m, $y);

	$startwday = 0;
	if (get_user_timezone_offset() < 99) {
		// We 'll keep these values as GMT here, and offset them when the time comes to query the db
		$display->tstart = gmmktime(0, 0, 0, $m, 1, $y); // This is GMT
		$display->tend = gmmktime(23, 59, 59, $m, $display->maxdays, $y); // GMT
		$startwday = gmdate('w', $display->tstart); // $display->tstart is already GMT, so don't use date(): messes with server's TZ
	} else {
		// no timezone info specified
		$display->tstart = mktime(0, 0, 0, $m, 1, $y);
		$display->tend = mktime(23, 59, 59, $m, $display->maxdays, $y);
		$startwday = date('w', $display->tstart); // $display->tstart not necessarily GMT, so use date()
	}

	// Align the starting weekday to fall in our display range
	if($startwday < $display->minwday) {
		$startwday += 7;
	}

	// Get events from database
	$events = calendar_get_events(usertime($display->tstart), usertime($display->tend), $users, $groups, $courses);
	if (!empty($events)) {
		foreach($events as $eventid => $event) {
			if (!empty($event->modulename)) {
				$cm = get_coursemodule_from_instance($event->modulename, $event->instance);
				if (!groups_course_module_visible($cm)) {
					unset($events[$eventid]);
				}
			}
		}
	}
	
	// Extract information: events vs. time
	calendar_events_by_day($events, $m, $y, $eventsbyday, $durationbyday, $typesbyday, $courses);

	$text = '';
	if(!isguest() && !empty($USER->id) && calendar_user_can_add_event()) {
		$text.= '<div class="buttons"><form action="'.CALENDAR_URL.'event.php" method="get">';
		$text.= '<div>';
		$text.= '<input type="hidden" name="action" value="new" />';
		$text.= '<input type="hidden" name="course" value="'.$courseid.'" />';
		$text.= '<input type="hidden" name="cal_m" value="'.$m.'" />';
		$text.= '<input type="hidden" name="cal_y" value="'.$y.'" />';
		$text.= '<input type="submit" value="'.get_string('newevent', 'calendar').'" />';
		$text.= '</div></form></div>';
	}

	$text .= get_string('detailedmonthview', 'calendar').': '.calendar_course_filter_selector($getvars);

	echo '<div class="header">'.$text.'</div>';

	echo '<div class="controls">';
	echo calendar_top_controls('month', array('id' => $courseid, 'm' => $m, 'y' => $y));
	echo '</div>';

	// Start calendar display
	echo '<table class="calendarmonth"><tr class="weekdays">'; // Begin table. First row: day names

	// Print out the names of the weekdays
	for($i = $display->minwday; $i <= $display->maxwday; ++$i) {
		// This uses the % operator to get the correct weekday no matter what shift we have
		// applied to the $display->minwday : $display->maxwday range from the default 0 : 6
		echo '<th scope="col">'.get_string($CALENDARDAYS[$i % 7], 'calendar').'</th>';
	}

	echo '</tr><tr>'; // End of day names; prepare for day numbers

	// For the table display. $week is the row; $dayweek is the column.
	$week = 1;
	$dayweek = $startwday;

	// Paddding (the first week may have blank days in the beginning)
	for($i = $display->minwday; $i < $startwday; ++$i) {
		echo '<td class="nottoday">&nbsp;</td>'."\n";
	}

	// Now display all the calendar
	for($day = 1; $day <= $display->maxdays; ++$day, ++$dayweek) {
		if($dayweek > $display->maxwday) {
			// We need to change week (table row)
			echo "</tr>\n<tr>";
			$dayweek = $display->minwday;
			++$week;
		}

		// Reset vars
		$cell = '';
		$dayhref = calendar_get_link_href(CALENDAR_URL.'view.php?view=day&amp;course='.$courseid.'&amp;', $day, $m, $y);

		if(CALENDAR_WEEKEND & (1 << ($dayweek % 7))) {
			// Weekend. This is true no matter what the exact range is.
			$class = 'weekend';
		}
		else {
			// Normal working day.
			$class = '';
		}

		// Special visual fx if an event is defined
		if(isset($eventsbyday[$day])) {
			if(count($eventsbyday[$day]) == 1) {
				$title = get_string('oneevent', 'calendar');
			}
			else {
				$title = get_string('manyevents', 'calendar', count($eventsbyday[$day]));
			}
			$cell = '<div class="day"><a href="'.$dayhref.'" title="'.$title.'">'.$day.'</a></div>';
		}
		else {
			$cell = '<div class="day">'.$day.'</div>';
		}

		// Special visual fx if an event spans many days
		if(isset($typesbyday[$day]['durationglobal'])) {
			$class .= ' duration_global';
		}
		else if(isset($typesbyday[$day]['durationcourse'])) {
			$class .= ' duration_course';
		}
		else if(isset($typesbyday[$day]['durationgroup'])) {
			$class .= ' duration_group';
		}
		else if(isset($typesbyday[$day]['durationuser'])) {
			$class .= ' duration_user';
		}

		// Special visual fx for today
		if($display->thismonth && $day == $d) {
			$class .= ' today';
		} else {
			$class .= ' nottoday';
		}

		// Just display it
		if(!empty($class)) {
			$class = ' class="'.trim($class).'"';
		}
		echo '<td'.$class.'>'.$cell;

		if(isset($eventsbyday[$day])) {
			echo '<ul class="events-new">';
			foreach($eventsbyday[$day] as $eventindex) {

				// If event has a class set then add it to the event <li> tag
				$eventclass = '';
				if (!empty($events[$eventindex]->class)) {
					$eventclass = ' class="'.$events[$eventindex]->class.'"';
				}

				echo '<li'.$eventclass.'><a href="'.$dayhref.'#event_'.$events[$eventindex]->id.'">'.format_string($events[$eventindex]->name, true).'</a></li>';
			}
			echo '</ul>';
		}
		if(isset($durationbyday[$day])) {
			echo '<ul class="events-underway">';
			foreach($durationbyday[$day] as $eventindex) {
				echo '<li>['.format_string($events[$eventindex]->name,true).']</li>';
			}
			echo '</ul>';
		}
		echo "</td>\n";
	}

	// Paddding (the last week may have blank days at the end)
	for($i = $dayweek; $i <= $display->maxwday; ++$i) {
		echo '<td class="nottoday">&nbsp;</td>';
	}
	echo "</tr>\n"; // Last row ends

	echo "</table>\n"; // Tabular display of days ends

	// OK, now for the filtering display 	 
		 echo '<div class="filters"><table><tr>'; 	 
	  	 
		 // Global events 	 
		 if($SESSION->cal_show_global) { 	 
			 echo '<td class="event_global" style="width: 8px;"></td><td><strong>'.get_string('globalevents', 'calendar').':</strong> '; 	 
			 echo get_string('shown', 'calendar').' (<a href="'.CALENDAR_URL.'set.php?var=showglobal&amp;'.$getvars.'">'.get_string('clickhide', 'calendar').'</a>)</td>'."\n"; 	 
		 } 	 
		 else { 	 
			 echo '<td style="width: 8px;"></td><td><strong>'.get_string('globalevents', 'calendar').':</strong> '; 	 
			 echo get_string('hidden', 'calendar').' (<a href="'.CALENDAR_URL.'set.php?var=showglobal&amp;'.$getvars.'">'.get_string('clickshow', 'calendar').'</a>)</td>'."\n"; 	 
		 } 	 
	  	 
		 // Course events 	 
		 if(!empty($SESSION->cal_show_course)) { 	 
			 echo '<td class="event_course" style="width: 8px;"></td><td><strong>'.get_string('courseevents', 'calendar').':</strong> '; 	 
			 echo get_string('shown', 'calendar').' (<a href="'.CALENDAR_URL.'set.php?var=showcourses&amp;'.$getvars.'">'.get_string('clickhide', 'calendar').'</a>)</td>'."\n"; 	 
		 } 	 
		 else { 	 
			 echo '<td style="width: 8px;"></td><td><strong>'.get_string('courseevents', 'calendar').':</strong> '; 	 
			 echo get_string('hidden', 'calendar').' (<a href="'.CALENDAR_URL.'set.php?var=showcourses&amp;'.$getvars.'">'.get_string('clickshow', 'calendar').'</a>)</td>'."\n"; 	 
		 } 	 
	  	 
		 echo "</tr>\n"; 	 
	  	 
		 if(!empty($USER->id) && !isguest()) { 	 
			 echo '<tr>'; 	 
			 // Group events 	 
			 if($SESSION->cal_show_groups) { 	 
				 echo '<td class="event_group" style="width: 8px;"></td><td><strong>'.get_string('groupevents', 'calendar').':</strong> '; 	 
				 echo get_string('shown', 'calendar').' (<a href="'.CALENDAR_URL.'set.php?var=showgroups&amp;'.$getvars.'">'.get_string('clickhide', 'calendar').'</a>)</td>'."\n"; 	 
			 } 	 
			 else { 	 
				 echo '<td style="width: 8px;"></td><td><strong>'.get_string('groupevents', 'calendar').':</strong> '; 	 
				 echo get_string('hidden', 'calendar').' (<a href="'.CALENDAR_URL.'set.php?var=showgroups&amp;'.$getvars.'">'.get_string('clickshow', 'calendar').'</a>)</td>'."\n"; 	 
			 } 	 
			 // User events 	 
			 if($SESSION->cal_show_user) { 	 
				 echo '<td class="event_user" style="width: 8px;"></td><td><strong>'.get_string('userevents', 'calendar').':</strong> '; 	 
				 echo get_string('shown', 'calendar').' (<a href="'.CALENDAR_URL.'set.php?var=showuser&amp;'.$getvars.'">'.get_string('clickhide', 'calendar').'</a>)</td>'."\n"; 	 
			 } 	 
			 else { 	 
				 echo '<td style="width: 8px;"></td><td><strong>'.get_string('userevents', 'calendar').':</strong> '; 	 
				 echo get_string('hidden', 'calendar').' (<a href="'.CALENDAR_URL.'set.php?var=showuser&amp;'.$getvars.'">'.get_string('clickshow', 'calendar').'</a>)</td>'."\n"; 	 
			 } 	 
			 echo "</tr>\n"; 	 
		 } 	 
	  	 
		 echo '</table></div>';
}

function calendar_show_upcoming_events($courses, $groups, $users, $futuredays, $maxevents, $courseid) {
	global $USER;

	$events = calendar_get_upcoming($courses, $groups, $users, $futuredays, $maxevents);

	$text = '';

	if(!isguest() && !empty($USER->id) && calendar_user_can_add_event()) {
		$text.= '<div class="buttons">';
		$text.= '<form action="'.CALENDAR_URL.'event.php" method="get">';
		$text.= '<div>';
		$text.= '<input type="hidden" name="action" value="new" />';
		$text.= '<input type="hidden" name="course" value="'.$courseid.'" />';
		/*
		$text.= '<input type="hidden" name="cal_m" value="'.$m.'" />';
		$text.= '<input type="hidden" name="cal_y" value="'.$y.'" />';
		*/
		$text.= '<input type="submit" value="'.get_string('newevent', 'calendar').'" />';
		$text.= '</div></form></div>';
	}

	$text .= get_string('upcomingevents', 'calendar').': '.calendar_course_filter_selector('from=upcoming');

	echo '<div class="header">'.$text.'</div>';

	if ($events) {

		echo '<div class="eventlist">';
		foreach ($events as $event) {
			$event->calendarcourseid = $courseid;
			calendar_print_event($event);
		}
		echo '</div>';
	} else {
		print_heading(get_string('noupcomingevents', 'calendar'));
	}
}

function calendar_course_filter_selector($getvars = '') {
	global $USER, $SESSION;

	if (empty($USER->id) or isguest()) {
		return '';
	}

	if (has_capability('moodle/calendar:manageentries', get_context_instance(CONTEXT_SYSTEM)) && !empty($CFG->calendar_adminseesall)) {
		$courses = get_courses('all', 'c.shortname','c.id,c.shortname');
	} else {
		$courses = get_my_courses($USER->id, 'shortname');
	}

	unset($courses[SITEID]);

	$courseoptions[SITEID] = get_string('fulllistofcourses');
	foreach ($courses as $course) {
		$courseoptions[$course->id] = format_string($course->shortname);
	}

	if (is_numeric($SESSION->cal_courses_shown)) {
		$selected = $SESSION->cal_courses_shown;
	} else {
		$selected = '';
	}

	return popup_form(CALENDAR_URL.'set.php?var=setcourse&amp;'.$getvars.'&amp;id=',
					   $courseoptions, 'cal_course_flt', $selected, '', '', '', true);
}

?>
